Tursiops truncatus
is the scientific name for the wellknown "Bottlenose Dolphin". In many films
we have seen the species as hard working actors. When the last "Flipper"(who
was a lady) died in the arms of her trainer Ric
O´Barry, Ric changed his mind and decided to go for the release
of captive dolphins who live like prisoners in the dolphinaria or in military
institutes, where they have been trained also for offense activities. The release
program is not easy to do. First one needs and good place with contact to the
open sea, then the money to transport, feed and "train back" the dolphins. They
really have to learn again how to use their SONAR system to echolocate living
and moving fish. Their skin has to get used to the direct sunlight when the
dolphin has been "existing" in environments of artificial light.

It may take one year
or more to bring a "flipper" back to the ocean. Some non-profit
organisations such as the "ARION DOLPHIN PROJECT" located
in Berlin support Rics projects and others which go in the same direction. Also
very important is the information work in the cities, where the people go to
dolphinaria to see the Entertainer - Dolphin. Some say, that way people learn
more about dolphins and the nature. On the other hand, fishermen look for new
jobs because of the overfishing of wide areas of the oceans. People should
have the chance to meet dolphins in a nice and respectful way. Their behaviour
in the wild is not comparable with the way they act in captivity. Careful and
controlled Whale watching may be one possibility to give jobs to the fishermen
and authentic information for interested people.

The one who really
loves mother nature will not have fun in the Zoo or in Sea Parks. The
legendary smile of a dolphin is not always a sign for joy and happiness.
In their little pool they cannot dive as deep as they want, they can´t
swim over long distances and the might feel like a human who was put in a telephone
cabin with mirrors on the walls inside. The acoustic reflections of the pool
walls disturbs the perception by echolocation, which could be described as:
Dolphins see with their ears ! The dolphin sonar is a high developed instrument
for localization and discrimination of objects in underwater environments, where
the visual sense is limited by plankton and the absorption of light. They can
detect signals of very low intensity, such as complex echos reflected by objects,
in noisy environments. The directional detection capabilities of dolphins are
perfectly adapted to the water. The use of sound in a frequency range of 300-180.000
Hz and the discrimination of some other sound parameters like phase differences
or doppler effects allows the dolphin a high resoluted perception of acoustical
waves.

Today, you see dolphins
in commercials for airlines, for cosmetics, and for insurance companies.
"Dinosaur-fever" is over; the dolphin wave is coming in. Why are humans
so fascinated by these mysterious creatures? The earliest signs of contact
between humans and dolphins are the drawings in Stone Age caves in Norway
and in South Africa. Romans, Polynesians and Americans write about the
mysterious rescue of victims of ship accidents. The ancient Greek culture
was also very interested in dolphins; poets described these marine mammals
as smooth and gentle creatures. Aristotle studied dolphins because he
was a biologist as well as a philosopher, and he thought that dolphins
were interested in getting closer to humans.

An Australian tribe included
the following in their version of the creation of the earth: " ... (the
dolphins) never forgot that all these "two-legged"humans on
land are their cousins. And that's why nowadays the dolphins come to
find their human relatives, to play with them as they did in the days
of the dreamtime." There are many good examples of voluntary cooperation
between humans and dolphins. From Brasil, Australia, West Africa and
France there are stories of how dolphins work together and cooperate
with fishermen. In his book "Dolphin Dreamtime", Jim Nollman describes
an old Australian Aborigine who talks about his childhood:

"As a little boy, I often
went fishing with my uncle. He studied dolphins for many years. When
he called, three dolphins would usually come to the side of the boat
and one to the aft. My uncle knew lots of different sounds and could
imitate the dolphins. Sometimes he took a little water into his hands
and then clapped in a special way. That's how he told the dolphins what
kind of fish he wanted to hunt."

The natural curiosity
of the dolphins as well as their extraordinary versatility and ability
to learn gave some people the idea using these living submarines with
their built-in high-tech ultrasound navigation system for military purposes.
Dolphins are able to localize small objects and differentiate various
materials by ultrasound analysis. They have been trained to transport
military hardware under water. Dolphin shows all over the world try
to make us believe that dolphins feel fine in prison. But dolphins in
captivity die earlier and the birthrate is low. And you get a completely
different point of view when you see dolphins out there in the blue.
Their joy of living and their intelligent behaviour in fishing or playing
is the reason why more and more people want to come closer to them and
to know more about these creatures. So what makes the difference
between dolphins and other mammals?

Over a couple of million
years of evolution, the whales and dolphins have developed a brain which
is unique in their medium of water. The ancestor of the dolphins went
back into the water about 60 million years ago. As soon as they got used
to the new medium of water, their brain mass rapidly increased. The design
of their brain, the specified zones, and the system of the neocoretex
is very similar to the human brain. That can make one wonder, because
the two most complicated brains in our biosphere have been generated in
total isolation: one on land and one on water - two completely different
ways of evolution. Neurophysiologists think that universal laws of nature
must exist to explain such a complicated but similar organisation of cells.
Dolphins are part of the cetaceans. Their evolution is not clear in all
details. A large number of missing links need to be found. The land-based
ancestors of the whales are called Mesonichydae and are extinct; but in
former times there were a number of different species. Some of these small-to-middle
sized mammals started moving into the coastal regions. The disappearance
of the dinosaurs 65 million years ago made it easy for the whale's ancestors
to conquer the flatwater areas and to start hunting fish -- a powerful
brain food. The paradise of fresh food in the oceans encouraged some of
the ancestors to go totally into the water. A couple of years ago,
two interesting missing links were found in Pakistan. "Ambulocetus natans",
10 feet long, predators, have been living in lagunas like amphibia. They
still had remnants of arms and legs, and the way they lived was very much
like they way seals live today. The "Rodhocetus", who lived more in the
water, had a body with many more modifications, such as a horizontal fluke
and very small leg rudiments. The skeletal fossil of these so-called whale
ancestors seem to be 50-52 million years old.

50 million years ago
the "Archaeocetae" appeared. They spent their whole lifetime in water.
One of the dominant predators of that time had a reptile-like skull,
flippers instead of arms, and a body like a snake up to 65 feet in length,
with a low water resistance.

The next step in dolphin's
evolution is the appearance of the 18- foot-long dolphin-like "Dorudonts"
and the similar "Basilosaurus" 40 million years ago. Modification of
the earbones and a posterior placement of the nose is visible on them.

25-35 million years ago
the cetaceans split up into Toothed whales (Odontoceti) and Baleen whales
(Mysticeti). The Toothed whales named "Squalodontae" became popular
25million years ago. They were very similar to the modern dolphins.
They had a very simple echo-location system and different kinds of teeth.

The "Kentriodontae"
had a much better bio-sonar system. They are the ancestors of most of
the toothed whales. All these dolphin species had teeth of the same
form and a highly evolved sonar system. Modern species, such as Bottlenose
dolphins or Orcas, descended from these ancestors.

The Cetaceans are divided
into Baleen- and Toothed whales. The Baleen whales themselves split up
into Grey whales, Right whales (like the Bowhead), and the Rorqual whales
(like Blue whales, Fin whales, and Humpback whales). The Baleen
whales get their name from the material which comes down from the roof
of their mouth. It serves as a filter system, which filters the water
the whale catches for plankton. Most of these species are in acute danger.

There are 68 species
of Toothed whales. The biggest Toothed whale is the Sperm whale, Physeter
catodon. The Beluga white whale and the Narwhal as Monodontidae. The
family of Beaked whales, Ziphiidae has 20 species. 6 species of Porpoises,
Phocoenidae, like the ones we find also in the Baltic Sea, and 5 different
species of fresh water dolphins which exist in the Amazon River, in
the Ganges, or in other big rivers are also included in the Toothed
whale family. There are 26 species of oceanic dolphins, and 6
species ofround headed whales like the orca or the pilot whale,
who are actually big dolphins. The Bottlenose dolphin is the most well
known, and when I talk about dolphins, I'm mostly talking about this
species that we can find all over the world and near the coasts.

The brain of a Bottlenose
dolphin (right pic.) can weigh up to 5 pounds. The neocortex is the area,
like in a human's brain (left pic.), where the higher brain functions
take place, such as memory, the power of association, creativity, the
ability to learn, and judgment. The following numbers will give you some
comparison between brains...

Average
Brainweight:

Chimpanse

0.75
pounds

Human

3.00
pounds

Dolphin

3.50
pounds

The relative
brain weight in comparison to the body weight of the creature, in percent:

Chimpanse

0.70 %

Human

2.10 %

Dolphin

1.17 %

Some scientists have
said that this means that a dolphin can never be as intelligent as "homo
sapiens sapiens," because their bigger body would need a bigger brain.
In comparison to the body weight, it is smaller. But dolphins do not
wear clothes.

They have blubber, which
is an insulating fat material that weighs a lot on land but contains
just a small number of nerves. The design of the dolphin's body is determined
by the absence of gravity in water, where the natural laws are different.
Another argument against the dolphin's intelligence: the specific echo-location
system occupies a lot of space in the brain. It actually is bigger than
the visual sense, the opposite of humans. However, that's not surprising,
because dolphins live in an acoustic environment. But it does not occupy
the whole brain. There are lots of "silent "zones" -- areas where consciousness
is located. And fresh water dolphins, for example, have a very effective
bio-sonar system, but only small brains, and so do other species with
a good acoustic sense.The Cerebellum is the area in the
brain for body coordination and balance. In the dolphin's brain, it
is very well developed. One can observe the elegant body control when
they do complicated maneuvers such as jumping and swimming in perfect
syncronicity.

The Thalamus is the central
point for the nerves that eventually reach the cortex. These are the
main cable highways that connect the several parts of the central nervous
system. The Thalamus in percent of the total brain weight:

Dolphin

2.65 %

Human

1.00 %

It is also interesting
to look at the Hypothalamus, the location of the autonomic nervous system
and instincts: The Hypothalamus, in percent of the total brain
weight:

Dolphin

0.17 %

Human

4.00 %

That may mean that humans
are much closer to instinctive behavior than dolphins. Dolphins control
every breath they take. They can concentrate blood in special areas
of their body, which they do when they dive. Because of the very big
difference between water and land, it is quite difficult to statistically
compute the performance capabilities between a dolphin's and a human's
brain. Neither the number of folds nor the relative brain weight nor
the relative number of nerve cells and their size in the cortex can
give us satisfying results.

But there is one method
of comparison which brings some surprising facts to the surface: the
investigation of the "Grey- cell-coefficient," which is the relationship
between the mass ofnerve cells and the total brain mass. That
means:

Volume of total brain
substance / Volume of the nerve cells = Grey-cell-coeff.

In order
to understand this method, you have to know that the density of nerve
cells in the cortex gets lower as the intelligence of a creature increase
The lower the nerve cell density, the more neuro connections become
possible. The lowest nerve cell density in our biosphere is found in
Humans, Whales and Elephants.The evolutionary history and the
difference of intelligence in mammals are easily seen when you compare
the following numbers:

Another special
thing in a dolphin's brain is the existence of "black brain substance",
the so-called "Substanzia Nigra". Dolphins and humans have this area.
Itis located in the older middle brain. Produced there are important
neuro-transmitters such as Dopamin and Endorphins. Dopamin is on one
hand nessesary for the control of complicated body coordination, and
on the other hand it involves the limbic system and the frontal part
of the neocoretex where thoughts are located. Endorphins are produced
when the body is exercised strenuously. They work to ease stress.Scientists thought that a dolphin's brain was the second one on earth
to reach Primate status. That is an arrogant opinion. Think about it.
The human brain has existed in its complexity for a hundred thousand
years. The dolphins have had theirs for 10 million years. No,
it is not the dolphins -- it is WE who have finally reached Primate
status! All these facts tell us that dolphins have a big brain and excellent
cognitive abilities. Stories, as well as scientific experiments, give
us this knowledge.

Intelligence is manifested
by the ability to communicate. Lots of animals are able to do that. But
the memory abilities and the power of abstract thinking of dolphins is
only comparable with the modern human brain.The classic experiment,
done by Dr. Javis Bastian proves that dolphins make plans and communicate
about abstract ideas with their language....

Two dolphins, Buzz and
Doris, were in captivity in a divided pool. In the beginning, they could
see each other. In both parts of the pool, two switches had been installed.
The dolphins were supposed to push the right switch if a light came
on and stayed on, or push the left switch if the light came on and blinked.
They learned quickly. But then the experiment got more complicated.Doris had to wait for Buzz to push the correct button, and
then she had to push the correct button, to get fish for both of them.
The next step was to build a wall between the two parts of the pool
which would not allow visual contact between the two dolphins. They
could only hear each other, and only Doris could see the light signal.The
constant light came on. Doris waited for her turn. Nothing happened,
because Buzz couldn't see the light signal. Then Doris made a sound.
Buzz reacted by pressing the right button for the constant light. Doris
continued with her constant light button and they got the fish.

Now, what does
this mean? Doris realized that Buzz couldn't see the signal. She told
him by sound that he had to press the correct button for the constant
light, which was the right one. The experiment has been repeated 50
times, and Buzz was most of the time right, although he couldn't
see the signal. That was the basis for the theory that dolphins can
communicate about abstract ideas, such as left and right. Experiments
with captured dolphins give us a lot of knowledge, but free-living dolphins
can tell us so much more. There are lots of documents and stories which
show us that dolphins act carefully and intelligently and prefer community.

We know thatdolphins
are able to exchange complex information. So now I want to talk about
the communication channels dolphins use. Perception and communication
are naturally connected witheach other. Transmitters and receivers
have to be good enough to transport the data.

Dolphins actually
do have a well functioning visual sense. The optical channel can be
used for two types of visual communication. The first is passive, which
means the whole body sends out its individual signals like scarred skin
areas, color specifications, or fin profiles. The second is active,
whichmeans the exchange of information by body language. The
eye of a dolphin is covered with a leather capsule which is very resistant
to high pressures. To protect it from the seawater, it produces an oily
substance. Incoming light goes through the cornea and the spherical
lens to reach the retina. Under the retina there is a kind of mirror
for amplifying the light intensity.The lens can change shape so that
the dolphin is able to focus its eye quite well for good vision both
under and above the water's surface. Because of their body structure,
they have only a small range binocular optical field, which is limited
by the sizeof their heads. With only one eye, monocular,
they can also seewhat is happening behind them. In an upward
direction, they are blind. "Spyhopping" whales and dolphins get themselves
in a vertical position and then turn around to actually scan thesurroundings for interesting or dangerous things.

A dolphin's tactile sense
is very well developed. Transmitters and receivers exist over the whole
body, with special areas where lots of nerve endings make them very
sensitive -- for instance, the flippers, fins, flukes, mouth, clitoris
and penis.They touch and embrace each other often without the wish to
copulate. For dolphins, the sense of smell is not relevant. Some regions
of the mouth work as a chemo-receptor. The female whale shave rudimentary
milk- producing glands which produce a transmitter substance. And one
of the newest discoveries about whales is that the whale penis has chemo-receptors
at the top to better find its way to the vagina.

The perception of and communication
with sound is very important for dolphins, because it's dark at 300 or
600 feetdeep, and higher up the plankton limits sight. Water
transports soundwaves more quickly and with less energy loss than air.
Sound travels in water at almost 5000 feet per second. The acoustic channel
of a dolphin has two parts: first, the common principle of communication,
which means the exchange of information with sounds, like a language;
and second, the high-tech biosonar echo-location system they have. This
is an active system. Passive systems receive transmitted or reflected
energy, such as light, for instance. The active SOund NAvigation and Ranging
(SONAR) system sends out energy as ultrasound, which is reflected by the
object, received back as an echo, computed in the brain and then projected
there as a picture.The frequency ranges up to more
than 200.000 Hertz in River dolphins. The dolphin's SONAR receiver is
very sensitive. Imagine, if you can, echos of small objects very much
lower in volume than theclicking sounds the dolphins produce.
The two ear capsules are not connected with the skull and they are well
isolated from each other. They hang by elastic cords in an air-filled
area. This creates a good perception of directional differences in sound.
The funnel-shaped eardrum is fixed in a hard and thin bone structure.
Here we find a separation into two receivers for two different frequency
ranges. One is the tympanic bone, which receives the high frequencies.
The lower frequencies reach the eardrum itself. Muscles in the middle
ear can change the acoustic sensitivity to the frequency the dolphin likes.
The cochlea in the inner ear analyzes the sounds and a large nervetransfers the information to the brain. But how does the sound reach
the inner ear? An external earwould not fit the perfect hydrodynamics
of the dolphin's body. Instead, there's just a little water-filled tube
behind the eye which may transport the lower frequencies. The high frequencies
are received by one fatty channel on each side of the dolphin's lower
jaw. These work as acoustic antennas. The time- or phase delay between
the two sidesmakes it possible for the dolphin to compute
the position of an object.

How sound is being produced
in the dolphin's skull seems to be clear now, because very intensive research
has taken place in the last few years. First of all, I'm going to explain
the common types of sounds dolphins produce. The whistles are analog sounds.
A wide variety of sounds is available. The dolphin can combine frequency
and/or intensity modulations of the sound wave it produces, along with
the element of time, in uncountable ways -- which makes it difficult for
humans to understand. Some characteristic whistles may be identified as
"alarm", "help", or personal identification whistles, which the dolphins
learn as babies. But the question remains whether something like a common
syntax exists or whether the type of communication dolphins use is based
on a completely different system. The frequencies dolphins use for communication
include the human frequency range as well as ultrasound frequencies.

The next type of sound
very often produced by dolphins is the Click. Clicks are pulse sounds.
A single click sounds for a very short time but contains a mixture of
frequencies. The maximum energy or sound- pressure level is emitted
as ultrasound. Different dolphin species prefer different frequencies.
Bottlenose dolphins emit sonar sounds with the highest power between
110-130 KHz. Pilot whales use 30-60 KHz. The clicks are being used to
locate objects; but they may also serve as a means of communication
between them.The third important sound group is the burst
pulse sounds. They sound like barking or moaning. But if you analyze
them with computers, you notice that these sounds are actually high
frequency "click packages".

The acoustic sense can
also be used with sounds dolphinsproduce in other parts
of their body, such as clapping the jaw, hitting the water surface with
their flukes, or breaching. The range of instrumental sound through
these means is big enough to use them for communication. The "let-the-bubbles-go-up
" game they like to play without producing any sound may be being
used as transmitter. Other dolphins could receive the signals with their
eyes or also with their echo-location system.

Some different theories
did exist about the location of the dolphin's sound generation.

The nasal sac theory...a
little underneath the blowhole is a channel which leads to a system
of elastic nasal sacs -- three pairs of sacs, all asymmetric, as is
the whole skull of toothed whales. The nasal plug is located in between
the two upper nasal sac pairs. When the air coming from the upper nasal
sacs passes the nasal plug, the whole area vibrates.

The larynx theory...the
larynx of a dolphin has no vocal chords. An extension of the larynx
tube works like a vibrator, and the whole system is held in place by
a strong muscle. To let the system vibrate, the dolphin pumps air through
the larynx.

But the latest discoveries
done with the help of high speed endoscopy and computer tomography,
speak for the "dorsal bursae" theory. These tiny extensions of the melon
tissue (also called:monkey lips) enter the nasal airway.
These structures move in correlation to the click repetition rate. The
lips are powered by air, which is being compressed in the nasal sacs.
The direct connection to the melon tissue couples the vibration with
very little energy loss.

The focusing of soundwaves
is done in several areas of the dolphin's head. The melon is a flexiblespace filled with an oily substance, located above the beak-like
upper jaw. It serves as an acoustic lens and as a good contact medium
with the water because it changes its own density as it gets closer
to the water. Therefore energy loss is low. The melon alone can
not explain the ability of the dolphin to focus sound so well. A parabolic
boney structure, called the acoustic shield, is located behind
the melon as a reflector. The high frequencies are emitted along the
body axis and the lower frequencies spread out from there. This plays
an important role in high resolution echolocation. Dolphins are
able to identify small objects that we wouldn't be able to differentiate
with our visual sense. They can analyze material by checking out itsresonance frequency. The speed of sound under
water is five times faster than in air. The wave length of a tone is
also five times more. That means that dolphins have to use high frequencies
for better directional characteristics. In air, bass frequencies are
not as easy to locate as high frequencies. In water, they have to use
high frequencies to "see" small objects with their ears. When the frequency
is too low and therefore the wave length too long, the emitted wave
could miss a small object.Dolphins are also able to scan
or x-ray other individuals. By scanning each other, the individuals
in a group may gain moredetails about their status. Here we
see that echo-location is an important part in dolphin communication.
It seems to be possible for dolphins to emit click-coded pictures while
communicating by whistles. So they don't need a word or symbol for "mackerel"
-- they may just transmit the picture.

Now let me say something
about Interspecies Communication. This subject could fill lots of speeches
or lectures, and a great number of dolphin-friends have dedicated their
life to the question of whether dolphins will one day talk to us. In the
past dolphins had to learn English and humans tried to learn 'Dolphinese'.
Computers and other technical equipment to analyze the dolphin's language
might help but nothing really big has happened so far. One of the biggest
barriers may be the big deviation in the time required to process information.
The human articulation can be measured in a tenth of a second; the dolphin's
in milli- or microseconds. For a dolphin, our language might sound like
an audiotape played much too slow, and their language is much too
fast for humans. I think that A real-time communication with a language
that humans could understand hasn't got a chance. Other ways have to be
explored, such as communication using different media, like music. From
my own experience, body language and telepathy might also be possible.
It's up to you to create a new idea in Interspecies Communication. No
book and no lecture can give you the feeling you get when you come in
touch with a dolphin. On an individual level, you can find personal contact.
Friendship with an intelligent species and with the whole biosphere is
for me the gateway to the future of Interspecies Communication.